Back-pedaling brake.



No. 680,244. Patented Aug. I3', 190|.

G. s. GREEN. Y

BACK PEDALING BRAKE.

(Application led Dec. 19, 1900.)

(No Model.)

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UNITED STATES i GEORGE S. GREEN, OF PHILADELPHIA, PENNSYLVANIA.

BACK-PEDALING BRAKE.

SPECIFICATION forming part of Letters Patent No. 680,244, dated August 13, 1901. Application filed December 19,'1900. Serial No. 40,383. (No model-.l

T0 all whom, it may concern.:

Be it known that I, GEORGE S. GREEN, of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Back-Pedaling Brakes, Whereof the following is a specification, reference being had to the accompanying drawings.

My invention relates particularly to that class of devices adapted for embodiment in connection with a vehicle-Wheel; and my invention consists of the combination of elements whereby the vehicle-wheel may be positively driven,may be freed for idle rotation or coasting, or may be braked to prevent its rotation at the will of the operator, as hereinafter more definitely specified and claimed.

In the accompanying drawings, Figure 1 is a fragmentary sectional view showing aconvenient form of my invention applied to a wheel-hub mounted to rotate upon a non-rotatable axle. Fig. 2 isa sectional view taken on the line 2 2 in Fig. l. Fig. 3 is a sectional View taken on the lin'e 3 8 in Fig. l. Fig. 4 is a perspective view of the clamp-lever indicated at the right-hand side of Fig. 3.

In said figures, A is the non-rotatableaxle of a vehicle-wheel, such as the rear Wheel of a bicycle. Said axle is secured in non-rotatable relation with the wheel-frame by the engagement of its attened shoulder ct in the opening in the frame and by the pressure of the nut a' against the side thereof.

B is the wheel-hub, which is to be positively driven, allowed to run free, or prevented from rotating in accordance with the three positions of which my device is capable. Said hub B comprises a drum-ange B', upon which is mounted the clamp-band C, whose opposite extremities c c' are respectively engaged by levers D D'. Said levers are fulcrumed, respectively, at d cl' in the sleeve E, which is mounted to rotate loosely upon the hub B. Said sleeve E serves as a bearing for the driving-Wheel F, which is adapted to receive an ordinary sprocket-chain and is provided With the lugf, which projects in position to engage the levers D D', as best shown in Fig. 2.

In the several figures the parts are shown in the position for coasting, wherein the band C is relaxed and the hub B, together with its flange B', are permitted to rotate idly within the band Without rotation of the drivingwheel F.' In said position of the parts the band C and sleeve E are maintained in stationary relation with respect to the axle A by the engagement of the pawl end D2 of the lever D' in a tooth of the ratchet A', fixed upon the non-rotatable axle A.

The operation of the device is as follows: The parts being in the coasting position shown and it being desired to positively rotate the hub B by rotation of the drivingwheelF in the direction of the arrow shown upon Fig. 2, the initiatmovement of said driving-Wheel F in the direction indicated serves to wedge the lug f between the sleeve E and the inner extremity of the lever D', and thereby swin g the latter outwardly. Said outward movement of the lever D' servesto disengage its pawl extremity D2 from the ratchet A' and simultaneously clamp the band C upon the periphery of the iiange B', so that by the further rotation of the driving-wheel F the hub B is positively driven in the direction of the arrow aforesaid, the

brake-band O, leversD D', and sleeve E being of course rotated therewith. Said clamping of the parts is effected by approximately onequarter revolutionof the driving-wheel F, and the parts may be restored to the normal idle position shown by reverse rotation of the driving-wheelF to the same extent. I Said reverse rotation of the driving-Wheel F in one direction not only brings its lug f to the intermediate position, (shown in Fig. 2,) but also restores the pawl D2 to engagement with the non-rotatable ratchet A', and further reverse rotation of said lug f wedges the latter between the sleeve E and the inner extremity of the Vclamp-lever D, thereby contracting the band C upon the periphery of the flange B'. It is 'to be understood that in accordance with the extent of the, traverse of the lug f in contact With the lever D the rotation of the hub B may be slightlyretarded or absolutely pre; vented, the paWl D2 of course rendering the band C a fixture with respect to the frame- Work of the vehicle during the braking operation of the device. In order to insure the instantaneous disengagement of the band C from the flange B', I prefer to make said band resilient.

IOO

- tures ot' my invention.

I claiml. In a back-pedaling brake, the combination with a hub and axle; of a clamp-band fitted to said hub;- a driving-Wheel mounted to rotate upon said hub; means arranged to clamp said band upon said hub by rotation of said driving-Wheel in either direction; and means to respectively prevent and permit the rotary traverse of said band in accordance with the movement of said driving-Wheel in one direction or the other, Substantially as set forth.

2. In a back-pedaling brake, the combination with a hub and axle; of a clamp-band fitted to said hub and normally relaxed thereon; a driving-Wheel mounted to rotate upon i said hub; opposed levers arranged to respectively clamp said band upon said hub when said driving-wheel is rotated in either direction; a non-rotatable ratchet; and Aa pawl fixed to one of said levers, arranged to en-l gage or disengage said ratchet in accordance with the movement ot said driving-Wheel in one direction or the other, substantially as set forth.

3. In a back-pedaling brake, the combination with a hub and axle; of a clamp-band fitted to said hub and normally relaxed thereon; a sleeve mounted to rotate upon said hub; opposed levers fulcrumed in said sleeve, and respectively engaged at their outer ends with the opposite extremities of said band; adriving-Wheel mounted to rotate upon said sleeve; a lug upon said driving-Wheel arranged to actuate one or the other ot said levers, When said driving-Wheel is rotated in either direction; a non-rotatable ratchet; and a pawl fixed to one of said levers/arranged to engage or disengage said ratchet in accordance with the movement of said ldriving-Wheel in one direction or the other, substantially as set forth.

GEORGE S. GREEN.

Witnesses:

ARTHUR E. PAIGE, E. L. FULLERTON. 

